Means for cooling the cylinders of internal-combustion engines.



L. DURAND.

MEANS FOR COOLING THE CYLINDERS OF INTERNAL COMBUSTION ENGINES.

APPLICATION FILED SEPT. 23. 1907.

967, 1 1 7. Patented Aug. 9, 1910.

JUihwaoeo idwenl'az *ZO/UO Z62 Zara/ed LWUPULD DURAND, F PARIS, FRANCE, A SSTGNOR OF ONE-EALF T0 admission UNITED STATES PATENT OFFICE.

nuniotr AUGUST LOUIS LEHMANN, OF LONDON, ENGLAND.

ESFOR-COOLING' THE CYLINDERS Oi INTERNAL- GQMBUSTION ENGINES.

Specification of Letters Patent.

Application filed September 23, 1907. Serial No. 394,172.

To all whom it may concern:

lie it known that it, Lnoronn DURAND, a citizen of the French Republic, residing at No. Rue Quersant, Paris, inthe Republic of France, have invented certain new and useful lmproved Means for Cooling the Cylinders of Internal-Combustion Engines, of which the following is a specification,

The present invention relates to means for cooling the cylinders of internal combustion engines, and it comprehends a' construction wherein the cylinders are cooled by passing the air required for the carbureting first through the cylinder jacket and then to the carbureter. Y

A structural embodiment of the invention is illustrated in the accom anyingw drawin wherein the figure is e si e elevation, witparts in section, of the improved engine.

The engine shown is, of the four-cylinder type, and consists oi two groups or sets 1, 2 of cylinders, the cylinders being cast in pairs. These groups are provided with separate cooling jackets 3', land with separate valve casings'fi, 6. A single carbureter 7 is employed for both groups, and

is shown as mounted on or attached to the-- base or crank casin 8 being the sup 1y pipe for the petrol or other liquid. Fi'bm the carbureter, there extends an admission pi e 9 which divides into branches leading to the admission valve casings, the outer ends of the branches being fitted in inlet apertures 20 provided in said casings. 'The cylinder jackets are each provided with a pair of admission apertures 16, one aperture of each pair being closed, while the other has a bent funnel-shaped air inlet pipe it) fitted therein. The carbureter is provided with an exhaust aperture 19 to which the lower end of the stem of pipe 9 connects, and, in addition, with a pair of lateral admission apertures 18, the last-mentioned apertures having connected thereto the lower ends of a pair of upwardly bent air pipes 11. Each pipe 11 connects at its upper end with a lower admission apertura li' of the adjacent cooling jacket, and-iaproi ided for that purpose with a flange M.

in operation, air. is drawn into the two cooling jackets through the pipes 10, and after circulating through said jackets is lead from the same to the carburetor byway of the pipes 11, the air cooling the jackets during its passage therethrough, and being itself heated at such time. Thegaseous mixture passes up from the carb'ureter through theadmission pipe 9 to the two valve-cas ings 5, 6, whence it is conveyed to the'cylinders in the usual manner.

It has been found that with pipes of sufficient sectional area, no overheatin of the cylinder heads takes place, but it is advisable in applying the above-described .arrangement to engines for motorcars or the like vto dispose the sloping funnel-shaped air inlet pipes inthe direction of motion, and to provide them with a strainer. The suction effect of the pistons will obviously cause a uniform flow of the air through the cooling jackets, i. 6., in the same manner as the cooling water in an ordinary circulation pump arrangement, and the movement of the volume of air will be the more regular as the s eed of the pistons increases. It is also evident that by battling the interior of the jackets in some manner, the air will be compelled to traverse a longer course, whereby the cooling effect will be increased.

While the drawing, as above stated, shows till ' a lesser number of cylinders will be obvious,

and a greater nuin er may, equally well arranged for.

l claim as my invention In a combustion engine, the combination of a plurality of groups of cylinders; a separate cooling jacket for each oup having of. course, be

an air admission device leaing directly thereinto, and having also an outlet aperture; a valve casing connected to each jacket and provided with an inlet aperture, each cylinder of each group having an admission valve for the charge arranged within the corres ending casing; a sin is carbureter for all oi said groups provi ed with inlet and outlet apertures; a plurality of separate pipes located exteriorlyot said jackets and connecting the outlet apertures ot the same with the inlet apertures oi the carburetor,

for supplying air to the latter after it has my hand in presence of the subscribing witcirculated through said jackets; and a nesses. branch pipe having its stein opening into the outlet aperture of said carbureter and its LEOPOLD DURAND.

5 branches opening into the inlet apertures in Witnesses: Y

sald casings, for supplying the charge to DEAN B. MASON, said valves. GEORGE E. LIGHT,

In testimony whereof I have hereunto set RUDQLF A. L. LEHMANN. 

